Screw type fastener having an unthreaded shank



FIG. 1 is a front view of my screw type fastener having an unthreaded shank;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a rear view thereof. 

The ornamental design for a screw type fastener having an unthreaded shank, as shown and described. 